# GaussPad

> Calculate Normal curve areas and tail probabilities for statistical analysis. (iPhone/iPad app by JUAN CARLOS ESPANA GALVAN.)

- Source: https://appshunter.io/ios/app/gausspad/id345292658 (this page in markdown: same URL + `.md`)
- Developer: [JUAN CARLOS ESPANA GALVAN](https://appshunter.io/developer/326085003)
- Category: Education, Business
- Price: $0.99
- Rating: 2.40/5 from 5 App Store ratings · 1 written reviews indexed
- Age rating: 4+
- Requires: iOS 11.0 · 1 MB
- Languages: English
- Released: 2009-12-12
- Data updated: 2026-06-10
- Monetization: paid
- User reviews in markdown: https://appshunter.io/ios/app/gausspad/id345292658/reviews.md

## What is GaussPad?

GaussPad is an easy-to-use application for iPhone and iPod Touch that focuses on giving the area beneath the Normal curve.
It's very useful to math students or engineers who need to find tail probabilities without having a Normal distribution table at hand.


KEY FEATURES

 * Graphic representation of the specified area under the bell curve.
 * Support for custom mean and variance.
 * Automatic calculation of associated tail probability.


TYPICAL USES

 - Finding the probability associated to a given Z score.
 - Finding the Z score associated to a given confidence interval.

## Key features

- Graphic representation of area under bell curve
- Custom mean and variance support
- Automatic tail probability calculation
- Find probability for Z score
- Find Z score for confidence interval

## Recent user reviews (1 of 1)

All indexed reviews: https://appshunter.io/ios/app/gausspad/id345292658/reviews.md

### 4/5 — one-trick pony

*2010-01-06, version 0*

This app does what it says, it returns the value of the area under the Gaussian curve from negative infinity to z, for a given mu and sigma.  This is a lot handier than looking it up in  a table.  The values it returns match the values I get from tables, to the same precision (5 digits).  The graph is useful for illustrative purposes if the the mean (mu) is close to zero, but there is no way to re-scale the graph if the mean is, say, 100.  Not a problem, we really only want the numerical value.

What would make this a great app (that I would pay for):
1)  Add the ability to calculate the area under the curve from z1 to z2, not just the tail.
2)  Add the ability to enter a normalized value (z-mu)/sigma rather than three separate values.
3)  Add the ability to switch from Gaussian to Q and erf functions.  It's really all the same problem, but sometimes one approach is better than others.
4)  Display the Gaussian, erf, and Q function formulas for reference.
5)  Make the graph more flexible, illustrative, useful.
6)  Add other common probability densities and calculate the statistics for them.

Still, it's great for free!

## Frequently asked questions about GaussPad

### What is GaussPad used for?

GaussPad is used to calculate the area beneath the Normal curve, which is essential for finding tail probabilities. It helps users determine probabilities associated with Z-scores or find Z-scores for given confidence intervals.

### Is GaussPad suitable for students?

Yes, GaussPad is designed to be useful for math students who need to find tail probabilities without relying on a physical Normal distribution table.

### What devices does GaussPad support?

GaussPad is available for iPhone and iPod Touch devices.

### How much does GaussPad cost?

GaussPad is a paid application, priced at $0.99.

### Does GaussPad have ads?

No, GaussPad does not contain advertisements.

### How often is GaussPad updated?

GaussPad was last updated on April 24, 2023, with version 2.0.1.

### What is the age rating for GaussPad?

GaussPad has an age rating of 4+, making it suitable for a wide range of users.

### Can GaussPad handle custom statistical parameters?

Yes, GaussPad supports custom mean and variance, allowing for more specific calculations beyond the standard Normal distribution.

## Version history (last 5 releases)

### 2.0.1 — 2023-04-24

Updated for iOS 11.

### 2.0 — 2017-06-04

This app has been updated by Apple to display the Apple Watch app icon.

Updated to iOS 10.

### 1.40 — 2016-02-02

Updated to iOS 9

### 1.32 — 2010-09-02

- Support for two-tailed probabilities

### 1.2 — 2010-02-25

- Graph zoom using finger gestures
 - Find Z value associated to a given Alpha tail probability

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## More apps by JUAN CARLOS ESPANA GALVAN

- [fxPad](https://appshunter.io/ios/app/fxpad/id326085000)
- [fxIntegrator](https://appshunter.io/ios/app/fxintegrator/id375694881)

All apps by JUAN CARLOS ESPANA GALVAN: https://appshunter.io/developer/326085003

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-10.*